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Old 02-16-2018, 09:41 PM   #1
Greg58
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Default Replacement driveshaft

I am getting together everything needed to install my overdrive transmission, I have everything but a shorter driveshaft. I can find a yoke for$65, what have others used as a substitute shaft? I don't really want to cut mine down.
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Old 02-16-2018, 09:55 PM   #2
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Default Re: Replacement driveshaft

Never done it but given an accurate needed dimension a good machinist could do the job.
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Old 02-17-2018, 08:41 AM   #3
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Default Re: Replacement driveshaft

What is this going in? You have a shoebox in your avatar and the driveshafts were the same for both standard and overdrive.
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Old 02-17-2018, 09:34 AM   #4
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Default Re: Replacement driveshaft

use a driveshaft out of a ford pu from 42 to 72, measure length and check with salvage yard, short bed, as a long bed is a two piece driveshaft, also a 55 to 64 powerglide chevy slip yoke will attach to this driveshaft
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Old 02-17-2018, 10:06 AM   #5
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Default Re: Replacement driveshaft

I had a driveline place shorten my driveshaft for less than $100, I wouldn't hesitate to do that.
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Old 02-17-2018, 11:33 AM   #6
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Default Re: Replacement driveshaft

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I've always done my own. In most cases, you don't shorten them much and if you're careful to preserve the balance and phasing, they turn out fine. If you have your own welder, it's free.

But I'm with Frank; are you sure you need to?
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Old 02-17-2018, 02:12 PM   #7
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Default Re: Replacement driveshaft

The overdrive transmission is a inch and a half longer than the standard trans, I've had driveshafts cut before but I want to keep the original in case I ever need to go back to the stock set up. The transmission came out of a 53, its a R-10. I'm putting it in my 50.
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Old 02-17-2018, 02:35 PM   #8
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Default Re: Replacement driveshaft

Quote:
Originally Posted by alanwoodieman View Post
use a driveshaft out of a ford pu from 42 to 72, measure length and check with salvage yard, short bed, as a long bed is a two piece driveshaft, also a 55 to 64 powerglide chevy slip yoke will attach to this driveshaft
Thanks, this helps.
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Old 02-17-2018, 03:18 PM   #9
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Default Re: Replacement driveshaft

Question, were truck transmissions longer? A friend picked it up in a lot of parts, was marked with a paint pen 53 Ford, didn't say car or truck. Franks post has me wondering,
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Old 02-17-2018, 08:07 PM   #10
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Default Re: Replacement driveshaft

Through a little searching I found this is not a truck transmission, this has the slip yoke tail shaft. What I've read the truck tail shaft had a yoke mounted on the output. I'll hit the salvage yards and find a driveshaft that has the correct yokes so I don't need special u-joints and have the local speed shop shorten it if needed. Here's the transmission with the one and a half inch section in between the gear box and tail shaft.
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Old 02-18-2018, 01:56 PM   #11
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Default Re: Replacement driveshaft

Here's one last picture of the tail shaft housing with I.d. numbers, I'm searching the web for info. If some knows what I have please post it. I had to save the image then rotate it before posting it.
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Old 02-18-2018, 04:26 PM   #12
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Default Re: Replacement driveshaft

only 4 speed truck trans and heavy duty 3 speed had the u-joint/yoke on the trans, all the rest had a slip yoke
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Old 02-18-2018, 04:32 PM   #13
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Default Re: Replacement driveshaft

I think what I have is the light duty truck trans, it is a 53. It doesn't have the clutch linkage stand off on the side cover like my transmission does. A friend picked up a couple of flatheads complete with o.d. transmissions, maybe I can do a little horse trading with him.
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Old 02-19-2018, 05:54 PM   #14
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Default Re: Replacement driveshaft

No go on the transmissions that my friend has, both are Mercury's. The 50 has the bell housing made to the case, the other is a 53 that's just like the one I have, the search continues.
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Old 02-19-2018, 06:18 PM   #15
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Default Re: Replacement driveshaft

I have one of those OD trans with the side fitting for the clutch linkage, if you are still looking for one. I plan on going to the flea market at Commerce on the 3 rd of March and could bring it. will get a picture of it tomorrow if you are interested.
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Old 02-19-2018, 06:59 PM   #16
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Default Re: Replacement driveshaft

Thanks Allen, the members here have been a lot of help. Frank said that the transmission was the same length as my non overdrive which is 26" from the face that bolts against the bell housing to the tail shaft housing end.
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Old 02-19-2018, 07:02 PM   #17
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Default Re: Replacement driveshaft

The 1949 thru 50 and maybe some early 51 Ford transmissions were basically the same length between standard 3-speed and overdrive. In 1951 the internal gears were all changed to the late diamond pattern gears and mounting changed a bit. The late 51 Mercury transmission should be the same basic unit as late 51 Ford even though they had different bell housings & rear axles. In 52 & 53, all the manual transmissions for cars were pretty much the same length with the same or similar mounting. Ford & Mercury had different clutches and bell housings but the transmissions didn't differ much. It was mostly the cars that changed in 1952.

Ford and Mercury cars used the same drive shaft in 1949 and 50 and had the same part numbers. Only the station wagons were different in all years. In 1951 they used both Ford and Mercury drive shafts depending on the two different rear cases that were used during the model year on both Ford and Mercury. In 1952 & 53 They went to a shorter drive shaft for Ford cars at 59" long. The earlier ones were between 61 11/16" and 61 23/32" so there was a length difference and it was likely due to the new bodies. The 52 & 53 Mercury shaft got longer at 62 3/32". You can see by the figures that the lengths didn't differ by much. They all used the same front slip yoke but they did connect to different rear axles depending on Ford or Mercury.

The 1953 F100 used a different part number transmission than the cars so it may have had a different tail shaft or possibly the input or main shaft was different.
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Old 02-19-2018, 07:22 PM   #18
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Default Re: Replacement driveshaft

Thanks again for all the info, here's the side cover of the one I have, my stock unit has a stand off below and to the back of the 1/reverse lever for clutch hardware mounting.
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Old 02-20-2018, 11:06 AM   #19
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Default Re: Replacement driveshaft

That looks like the later 52/53 Ford /Mercury car type. No rail switch on them. They had swing pedals so they didn't need the clutch fitting. There were even later ones on the Y-blocks.

It would be nice if someone put together a listing of all the different designs of the Borg Warner overdrive equipped transmissions. The list would be long though since so many manufacturers used them. Ford later used T85 & T86 versions. One has top loading gears and the other has the side load. Chrysler, GM, and AMC all had versions and they were all different too.
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Old 02-20-2018, 12:26 PM   #20
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Default Re: Replacement driveshaft

look at this OD trans, shifts good thru the gears on the box
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Old 02-20-2018, 12:57 PM   #21
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Default Re: Replacement driveshaft

Alan that looks like what I'm looking for, I've got one local guy to talk to that has one. Let me get with him first since I've asked and I'll get back to you. Thanks, Greg.
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Old 02-20-2018, 02:03 PM   #22
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Default Re: Replacement driveshaft

I'm tossing out ideas, it has been a long time since i've looked at the two transmissions. Will the '50 non_OD shift cover fit the '53 OD trans? You might have to move the 1st/rev shift lever with the reverse lock-out over to the non-OD cover.

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Old 02-20-2018, 02:34 PM   #23
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Default Re: Replacement driveshaft

The 53 trans is 1.5" longer than the 50, I didn't want to cut my driveshaft in case I wanted to go back to the stock unit. From what I've learned here and from the local flat head era guys the internal parts of the r-10 should interchange, if I can get a complete unit the one I have now will be spare parts.
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Old 02-20-2018, 06:44 PM   #24
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Default Re: Replacement driveshaft

The parts ONLY interchange between transmissions with the same type of gears. The change was in 1951. Ford changed over to what is referred to as the diamond pattern gears. Some have odd numbers on the input shaft too so I wouldn't plan on interchangeability between 1949/50 and the later gear sets. There might be a couple of parts that interchange but don't count on anything substantial.

The 1951/53 transmissions were stouter than the earlier ones but you always find other stuff like the clutch mounting provisions that muck things up for a swap.
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Old 02-20-2018, 06:57 PM   #25
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Default Re: Replacement driveshaft

Thanks, I remember you posted that earlier. These came along before my time, my first transmission repair was a Muncie four speed, I broke several in my younger years.
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Old 02-21-2018, 01:30 AM   #26
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Default Re: Replacement driveshaft

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rotor wrench is correct as usual, you have to know for a fact its a 51 or later, they look the same on the outside, gear cut and tooth count are different inside
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Old 03-02-2018, 03:26 PM   #27
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Default Re: Replacement driveshaft

The local man has two transmissions and is going to sell me one, thanks to everyone that helped on this.
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Old 03-31-2018, 08:20 PM   #28
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Default Re: Replacement driveshaft

I got the overdrive transmission installed today, everything went well. I had to make clearance for the solenoid but not much, I also had to weld a extension on the mount. My trans is a 51 which uses a wider mount than the 49-50 and the mount is one inch farther forward than the stock unit. Overdrive is what my car needed all along, its barely above idling at 55 mph.
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Old 04-01-2018, 07:21 AM   #29
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Default Re: Replacement driveshaft

Thanks for the update
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Old 04-01-2018, 09:36 AM   #30
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Default Re: Replacement driveshaft

I think you will love that set up. Have fun.
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Old 04-01-2018, 09:48 AM   #31
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Default Re: Replacement driveshaft

I haven't took it out of O.D. since I installed it, from what I've read some say theirs lugs or lacks power, mine pulls good so I'm ok. I'm not totally satisfied with the mount I made so I'm planning a different approach.
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Old 04-02-2018, 12:49 PM   #32
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Default Re: Replacement driveshaft

If you can find one, replace your cross member with one out of a '51. It's a bolt in in a 49 or 50 and accepts the wider mount.
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Old 04-02-2018, 01:33 PM   #33
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Default Re: Replacement driveshaft

I've been thinking about doing that,seeing you have a 51 as your avatar do you happen to have a picture of the mount area or do you remember how it mounts? The 50 mount sits on top of the member, the 51 mount has to have a offset weld to it to keep the transmission at the correct ride height. I measured the distance from the center of the output shaft of my old unit to the center of the tunnel before removing it and duplicated it when making mount adjustments, the 51 mount in stock form raises the trans too much, it hits the floor plan.
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